分解因式1.7[a+1]+x[a+1] 2.3[a-b]^2+b[b-a] 3.2[m-n]^2-m[m-n]4.x[x-y]^2-y[y-x]^2 5.m[a^2+b^2]+n[a^2+b^2] 6.18[a-b]^3-12b[b-a]^27.[2a+b][2a-3b]-3a[2a+b] 8.x[x+y][x-y]-x[x+y]^29.先分解因式,在计算求值【1】4x[m-2]-3x[m-2] ,其实x=1.5 m=6

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